2 doctors weighed in:

Shivered after delivery. A lot. Why was that?

2 doctors weighed in

Pregnancy creates another human being and the baby was a source of heat-energy.

You acclimated slowly to the growing baby so it was less noticeable. Then in short period of time that little heat source is gone and you shiver. Adults produce 116 watts/hr (2400 kcal/day) on average, a newborn produces 19 watts/hr (116 kcal/kg/day).

In brief:
LOST your heater

Pregnancy creates another human being and the baby was a source of heat-energy.

You acclimated slowly to the growing baby so it was less noticeable. Then in short period of time that little heat source is gone and you shiver. Adults produce 116 watts/hr (2400 kcal/day) on average, a newborn produces 19 watts/hr (116 kcal/kg/day).
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